129742228 has 24 divisors (see below), whose sum is σ = 283074624. Its totient is φ = 50548800.

The previous prime is 129742219. The next prime is 129742247. The reversal of 129742228 is 822247921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210313 + ... + 210928.

It is an arithmetic number, because the mean of its divisors is an integer number (11794776).

Almost surely, 2^129742228 is an apocalyptic number.

It is an amenable number.

129742228 is an abundant number, since it is smaller than the sum of its proper divisors (153332396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129742228 is a wasteful number, since it uses less digits than its factorization.

129742228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421263 (or 421261 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 129742228 is about 11390.4445918498. Note that the first 3 decimals coincide. The cubic root of 129742228 is about 506.2446545592.

The spelling of 129742228 in words is "one hundred twenty-nine million, seven hundred forty-two thousand, two hundred twenty-eight".